. >> reporter: jeffrey dumas, a former clinton sergeant with 22 years of service, knows the prison insidet; and knew inmate sweat, and joyce mitchell, well. >> i knew, "okay, this is not true at that level." there is no way in that facility with the officer in the shop and the way it's constructed that they could have done something like that. >> reporter: still, joyce says she knew salacious innuendo was in the air and she had to try to nip it in the bud. >> i was the one that -- when they made the assumption, i went to the superiors, i guess if that's what you want to call them. and i made the complaint that they were saying stuff that was untrue. >> you thought your reputation was being sullied. >> yes. and they -- they came, they investigated it, and they found nothing. >> reporter: yet that episode didn't seem to deter joyce from becoming close with another murderer -- sweat's buddy, richard matt. how long did it take, mrs. mitchell, for you to consider him to be a friend as opposed to just another inmate? >> it took a little while, but he was in different shops with me, too. you kno

. >> reporter: jeffrey dumas, a former clinton sergeant with 22 years of service, knows the prison insideknew inmate sweat, and joyce mitchell, well. >> i knew, "okay, this is not true at that level." there is no way in that facility with the officer in the shop and the way it's constructed that they could have done something like that. >> reporter: still, joyce says she knew salacious innuendo was in the air and she had to try to nip it in the bud. >> i was the one that -- when they made the assumption, i went to the superiors, i guess, if that's what you wanna call them. and i made the complaint that they were saying stuff that was untrue. >> you thought your reputation was being sullied. >> yes. and they -- they came, they investigated it, and they found nothing. >> reporter: yet that episode didn't seem to deter joyce from becoming close with another murderer -- sweat's buddy, richard matt. >> how long did it take, mrs. mitchell, for you to consider him to be a friend, as opposed to just another inmate? >> it took a little while, but he was in different shops with me, too. you know, h